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-rw-r--r--src/video_core/transform_feedback.cpp99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/video_core/transform_feedback.cpp b/src/video_core/transform_feedback.cpp
new file mode 100644
index 000000000..ba26ac3f1
--- /dev/null
+++ b/src/video_core/transform_feedback.cpp
@@ -0,0 +1,99 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <array>
+#include <vector>
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "shader_recompiler/shader_info.h"
+#include "video_core/transform_feedback.h"
+
+namespace VideoCommon {
+
+std::vector<Shader::TransformFeedbackVarying> MakeTransformFeedbackVaryings(
+ const TransformFeedbackState& state) {
+ static constexpr std::array VECTORS{
+ 28, // gl_Position
+ 32, // Generic 0
+ 36, // Generic 1
+ 40, // Generic 2
+ 44, // Generic 3
+ 48, // Generic 4
+ 52, // Generic 5
+ 56, // Generic 6
+ 60, // Generic 7
+ 64, // Generic 8
+ 68, // Generic 9
+ 72, // Generic 10
+ 76, // Generic 11
+ 80, // Generic 12
+ 84, // Generic 13
+ 88, // Generic 14
+ 92, // Generic 15
+ 96, // Generic 16
+ 100, // Generic 17
+ 104, // Generic 18
+ 108, // Generic 19
+ 112, // Generic 20
+ 116, // Generic 21
+ 120, // Generic 22
+ 124, // Generic 23
+ 128, // Generic 24
+ 132, // Generic 25
+ 136, // Generic 26
+ 140, // Generic 27
+ 144, // Generic 28
+ 148, // Generic 29
+ 152, // Generic 30
+ 156, // Generic 31
+ 160, // gl_FrontColor
+ 164, // gl_FrontSecondaryColor
+ 160, // gl_BackColor
+ 164, // gl_BackSecondaryColor
+ 192, // gl_TexCoord[0]
+ 196, // gl_TexCoord[1]
+ 200, // gl_TexCoord[2]
+ 204, // gl_TexCoord[3]
+ 208, // gl_TexCoord[4]
+ 212, // gl_TexCoord[5]
+ 216, // gl_TexCoord[6]
+ 220, // gl_TexCoord[7]
+ };
+ std::vector<Shader::TransformFeedbackVarying> xfb(256);
+ for (size_t buffer = 0; buffer < state.layouts.size(); ++buffer) {
+ const auto& locations = state.varyings[buffer];
+ const auto& layout = state.layouts[buffer];
+ const u32 varying_count = layout.varying_count;
+ u32 highest = 0;
+ for (u32 offset = 0; offset < varying_count; ++offset) {
+ const u32 base_offset = offset;
+ const u8 location = locations[offset];
+
+ UNIMPLEMENTED_IF_MSG(layout.stream != 0, "Stream is not zero: {}", layout.stream);
+ Shader::TransformFeedbackVarying varying{
+ .buffer = static_cast<u32>(buffer),
+ .stride = layout.stride,
+ .offset = offset * 4,
+ .components = 1,
+ };
+ if (std::ranges::find(VECTORS, Common::AlignDown(location, 4)) != VECTORS.end()) {
+ UNIMPLEMENTED_IF_MSG(location % 4 != 0, "Unaligned TFB");
+
+ const u8 base_index = location / 4;
+ while (offset + 1 < varying_count && base_index == locations[offset + 1] / 4) {
+ ++offset;
+ ++varying.components;
+ }
+ }
+ xfb[location] = varying;
+ highest = std::max(highest, (base_offset + varying.components) * 4);
+ }
+ UNIMPLEMENTED_IF(highest != layout.stride);
+ }
+ return xfb;
+}
+
+} // namespace VideoCommon